42021136 has 20 divisors (see below), whose sum is σ = 82533532. Its totient is φ = 20722176.

The previous prime is 42021121. The next prime is 42021139. The reversal of 42021136 is 63112024.

It can be written as a sum of positive squares in 2 ways, for example, as 34292736 + 7728400 = 5856^2 + 2780^2 .

It is not an unprimeable number, because it can be changed into a prime (42021139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16821 + ... + 19156.

Almost surely, 2^42021136 is an apocalyptic number.

It is an amenable number.

42021136 is a deficient number, since it is larger than the sum of its proper divisors (40512396).

42021136 is a wasteful number, since it uses less digits than its factorization.

42021136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36058 (or 36052 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 42021136 is about 6482.3711711071. The cubic root of 42021136 is about 347.6609636779.

The spelling of 42021136 in words is "forty-two million, twenty-one thousand, one hundred thirty-six".